CN107479607A - A kind of current sample change-over circuit and LED constant current power supply - Google Patents
A kind of current sample change-over circuit and LED constant current power supply Download PDFInfo
- Publication number
- CN107479607A CN107479607A CN201710769335.3A CN201710769335A CN107479607A CN 107479607 A CN107479607 A CN 107479607A CN 201710769335 A CN201710769335 A CN 201710769335A CN 107479607 A CN107479607 A CN 107479607A
- Authority
- CN
- China
- Prior art keywords
- diode
- current
- circuit
- switch
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is DC
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4266—Arrangements for improving power factor of AC input using passive elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of current sample change-over circuit and LED constant current power supply, the current sample change-over circuit includes constant current chip control circuit, current sampling unit, first resistor, second resistance, one end of first resistor is connected with one end of sample rate current port and second resistance, the other end ground connection of first resistor, the other end of second resistance is connected with constant current chip control circuit and the current sampling unit, and constant current chip control circuit controls the output of sample rate current using the open switch of the current sampling unit；Constant-current supply includes current sampling circuit, EMI filter circuit, half-bridge harmonic circuit, rectifying and wave-filtering output circuit and power factor correction circuit.The present invention passes through each circuit cooperating, hoisting power factor value and harmonics restraint.In addition, the electric current of main line of the present invention is not passed through toggle switch, toggle switch is protected；And cost does not have any purpose for increasing and reaching current sample yet, product reliability is improved.
Description
Technical field
The present invention relates to LED drive power field, more particularly to a kind of current sample change-over circuit and LED constant current electricity
Source.
Background technology
LED lamp is the light source of little power consumption in existing light fixture product, luminous efficiency height, energy-conservation and service life length, extensively
It is general to be applied in daily life, it is the favorable substitutes of fluorescent lamp, but in replacement process, LED is as a kind of direct current work(
Rate losser, only it can just be lighted under appropriate D/C voltage and electric current, the output dc voltage of LED drive power cannot be below
LED or LED strip forward drop.When shelves LED drive power parallel connection LED or the LED strip being in parallel, due to each LED
C-V characteristic have differences, forward current in identical forward voltage difference is larger, if powered using constant pressure, can lead
Cause each LED brightness and colourity larger difference to be present, therefore require constant current rather than constant pressure driving, in general, LED drives
Dynamic power supply allows for providing nominal constant electric current and constant voltage simultaneously.
Original LED constant current source product, the setting of its output current, the electric current of the main circuit by directly using primary side
Parameter, it is configured, and there is the electric current of main circuit is excessive, additional device work(needed for current sampling devices and current sample
Rate loss is big, and it is resistance that current sample, which is typically selected, and electric current additional device typically selects toggle switch, its electric stress being subject to
Greatly, component failure is easily caused；And this circuit effectively reduces the current stress of toggle switch by changing the value of sampled voltage, with
Reach solution problem above.
In the prior art, the electric current that toggle switch is main circuit, the excessive electric current for being well over toggle switch of electric current are flowed through
Limit value.
The content of the invention
In view of this, it is necessary to a kind of current sample change-over circuit applied to LED power is provided, solves and passes through dial-up
The problem of electric current of switch is excessive.
The present invention is realized according to following technical scheme：
A kind of current sample change-over circuit applied to LED power, it is characterised in that the current sample change-over circuit includes
Constant current chip control circuit, current sampling unit, sample rate current input port, first resistor, second resistance, the first resistor
One end be connected with one end of the sample rate current input port and the second resistance, another termination of the first resistor
Ground, the other end of the second resistance are connected with constant current chip control circuit and the current sampling unit, the constant current core
The detection magnitude of voltage of piece control circuit is a steady state value, cut-offs control using at least one switch of the current sampling unit
Flow through the size of the electric current of the current sampling unit.
Further, the current sample change-over circuit also includes 3rd resistor, the 3rd resistor and the current sample
Unit is in parallel, and one end of the 3rd resistor is connected between the constant current chip control circuit and second resistance, and the described 3rd
The other end ground connection of resistance.
Further, the first resistor, the second resistance and 3rd resistor are multiple resistant series or parallel connection
Connection forms.
Further, the current sampling unit includes the 4th resistance and first switch, the first switch and the 4th electricity
Resistance is connected in series, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the perseverance
Flow chip control circuit connection.
Further, the current sampling unit also includes the 5th resistance and second switch, the second switch and the 5th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the current sampling unit also includes the 6th resistance and the 3rd switch, the 3rd switch and the 6th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the current sampling unit also includes the 7th resistance and the 4th switch, the 4th switch and the 7th
Resistant series connect, it is in parallel with 3rd resistor again after being connected in series, parallel connection formed end points one end be grounded, the other end with it is described
Constant current chip control circuit connects.
Further, the first switch, second switch, third switch, the 4th switch are opened for toggle switch or rotation
Close.
A kind of LED constant current power supply of the present invention, including current sampling circuit described in the claims any one of 1-8,
And EMI filter circuit, half-bridge harmonic circuit, rectifying and wave-filtering output circuit, the input connection power supply of the EMI filter circuit
Input, the half-bridge harmonic circuit is connected with the rectifying and wave-filtering output circuit, it is characterised in that：Filtered in the EMI
Power factor correction circuit is connected between circuit and the half-bridge harmonic circuit, the power factor correction circuit includes two poles
Pipe D1, diode D2, diode D3, diode D4, electrochemical capacitor C10, wherein, diode D1 negative electrode and diode D2 the moon
Extremely it is connected, diode D1 anode is connected with diode D4 negative electrode, and diode D2 anode is connected with diode D3 negative electrode,
Diode D3 anode is connected and is grounded with diode D4 anode, electrochemical capacitor C10 positive pole and diode D1 negative electrode phase
Even, electrochemical capacitor C10 negative pole is connected with diode D3 anode.
Preferably, the power factor correction circuit also include diode D5, diode D6, diode D7, diode D8,
Electric capacity C3, electric capacity C4, electric capacity C6, diode D5 are connected in parallel with electric capacity C3, and diode D5 is connected to diode D3 and electrolysis electricity
Between holding C10, diode D5 negative electrode is connected with diode D3 anode, diode D5 anode and electrochemical capacitor C10 the moon
Pole and diode D8 anode are connected, and diode D6 negative electrode is connected with diode D1 anode, diode D7 negative electrode with
Diode D2 anode is connected, and diode D6 anode is connected with diode D7 anode and is grounded by electric capacity C6, diode
D6 anode is simultaneously connected with diode D8 negative electrode, and diode D4 anode is grounded by electric capacity C4.
Compared with prior art, the present invention has following technique effect：
The electric current of main line of the present invention is not passed through toggle switch, the electric current very little of toggle switch, reaches current limit far away,
Toggle switch is protected, extends the life-span of toggle switch, and the cost of LED constant current source does not have any increase, has reached electric current yet
The purpose of sampling, improves product reliability.
Brief description of the drawings
Embodiments of the invention are described below in conjunction with accompanying drawing, wherein：
Fig. 1 is the current sample change-over circuit schematic diagram applied to LED power of the present invention；
Fig. 2 is the schematic diagram of the LED constant current power supply of the present invention；
Fig. 3 is the circuit diagram of a specific embodiment of the LED constant current power supply of the present invention；
Reference：1-EMI filter circuits, 2- power factor correction circuits, 3- half-bridge harmonic circuits, 4- rectifying and wave-filterings are defeated
Go out circuit, 5- constant current chip control circuits, 6- current sampling units.
Embodiment
The specific embodiment of the present invention is further elaborated below based on accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment stated only is used as embodiment, the protection domain being not intended to limit the present invention.
The current sample change-over circuit schematic diagram applied to LED power that Fig. 1 is, as shown in figure 1, one kind of the present invention should
Inputted for the current sample change-over circuit of LED power, including constant current chip control circuit, current sampling unit 6, sample rate current
Port, first resistor, second resistance, one end of the first resistor and the sample rate current input port and second electricity
One end connection of resistance, the other end ground connection of the first resistor, the other end and the constant current chip control circuit 5 of the second resistance
And the current sampling unit 6 connects, the detection magnitude of voltage of the constant current chip control circuit 5 is a steady state value, utilizes institute
State the size cut-off control and flow through the electric current of the current sampling unit of at least one switch of current sampling unit 6.
Wherein, constant current chip control circuit uses RED2511 chips, and the chip is an advanced COMS control chip,
For the LLC converter that resonates, RED2511 is using control self-oscillation converter scheme, and driving two is low in semibridge system configuration
The topological structure of RediSem LLC converter technology is optimized for cost bipolar transistor, RED2511 chips.
The current sample change-over circuit of the present invention also includes 3rd resistor, the 3rd resistor and the current sample list
Member 6 is in parallel, and one end of the 3rd resistor is connected between the constant current chip control circuit and second resistance, the 3rd electricity
The other end ground connection of resistance.The first resistor, the second resistance and 3rd resistor are multiple resistant series or connection in parallel
Connect and form.
The current sampling unit includes the 4th resistance and first switch, and the first switch connects with the 4th resistant series
Connect, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the constant current chip control
Circuit connection processed.The current sampling unit also includes the 5th resistance and second switch, the second switch and the 5th resistance string
Connection connection, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end and the constant current core
Piece control circuit connects.Further, the current sampling unit also includes the 6th resistance and the 3rd switch, the 3rd switch
It is connected with the 6th resistant series, in parallel with 3rd resistor again after being connected in series, one end ground connection for the end points that parallel connection is formed, the other end
It is connected with the constant current chip control circuit.Further, the current sampling unit also includes the 7th resistance and the 4th switch,
4th switch is connected with the 7th resistant series, in parallel with 3rd resistor again after being connected in series, and the one of the end points that parallel connection is formed
End ground connection, the other end are connected with the constant current chip control circuit.
With reference to accompanying drawing 1, current sample conversion work principle of the invention is as follows：
Set first resistor RfAs the setting resistance of the current sample change-over circuit, constant current chip control circuit is set
Detection magnitude of voltage is Vsense, wherein VsenseFor a steady state value, the current value size for being set by current sampling unit is Isense,
The resistance value size of setting electric current sampling unit is Rsense, then have Isense=Vsense/Rsense, wherein RsenseIt is to be opened according to dial-up
What the size of the parallel resistance being switched on and off of pass or rotary switch determined, it is possible thereby to learn, pass through first resistor Rf
Magnitude of voltage VfSize is：Vf=Vsense+Isense·Rs, wherein, RsFor second resistance, pass through first resistor RfSize of current
IfFor：If=Vf/Rf=(Vsense+Isense·Rs)/Rf, finally calculate sampling input current IcSize, Ic=If+Isense。
To IcFurther simplify, obtain：
It was found from above formula, due to detecting magnitude of voltage VsenseFor definite value, RfAnd RsAlso it is definite value, as long as therefore by adjusting electricity
Flow the resistance value R of sampling unitsenseSize can then adjust the size of sampling input current.And pass through first switch K1, second
Switch K2, the 3rd switch K3, the 4th switch K4Any switch closure or the resistance of current sampling unit can be changed when disconnecting
Value Rsense, can thus change the current value size of current sampling unit.
According to the connection in series-parallel principle of circuit, as setting second resistance RsResistance be sized substantially larger than first resistor RfElectricity
During resistance, then obtain：
Due to VsenseFor steady state value, RfAlso it is definite value, settingOn the basis of electric current, then
Have
Specifically, R is worked assenseMuch larger than RsWhen, then have
Work as Rsense=RsWhen, then have
Work as Rsense=1/2RsWhen, then have
By that analogy, by adjusting RsenseWith RsRatio size be adjustable input current and reference current relation.
Further, since second resistance R is setsResistance size be much larger than first resistor RfResistance value, therefore flow through second
Resistance RsElectric current be just much smaller than first resistor RfElectric current, the electric current for flowing through toggle switch is not more than the electric current of toggle switch
Limit value, toggle switch is protected, extend the life-span of toggle switch.
In a particular embodiment of the present invention, composition first resistor is connected in parallel using resistance R5 and resistance R6, using R9
As second resistance, three resistance of ground are not accessed.Current sampling unit, current sample are formed using three resistance and three switches
Unit with any resistor coupled in parallel, specifically, not refer to Fig. 3, the present invention is by setting resistance R20, R21, R22 and each switch
Series connection is in parallel again to form current sampling unit, and those skilled in the art can be arranged as required to multiple switch and corresponding resistance
Series connection, and composition current sampling unit in parallel, the present invention are not limited this between each other.
According to the demand specifically applied, switch of the invention is toggle switch or rotary switch.Specifically, it is of the invention
Using toggle switch, by setting being switched on and off for toggle switch, the parallel connection of three resistance multiple combinations is realized, is obtained
The resistance size of different parallel resistances.
The current sample change-over circuit of the present invention is in LED constant-current supply, refer to accompanying drawing 2, one kind of the invention
LED constant current power supply, including：Above-mentioned current sample change-over circuit and EMI filter circuit 1, half-bridge harmonic circuit 3, rectifying and wave-filtering
Output circuit 4, the input of the input connection AC power of the EMI filter circuit 1, the half-bridge harmonic circuit 3 and institute
Rectifying and wave-filtering output circuit 4 is stated to connect.Wherein, EMI filter circuit 1 is typically connected on the power of AC network and high frequency switch power
Between translation circuit, its main function is to suppress Switching Power Supply in itself to the counter-measure of AC network, while also suppresses to scurry into out
High-frequency Interference in the AC network in powered-down source.
EMI filter circuit 1 includes suppressing filter capacitor and common-mode choke coil, and wherein electric capacity is shunt capacitance, is act as
The High-frequency Interference of suppression city net input, two number of turn identical coils being wound in same closed circuit magnet ring, if it is defeated in Same Name of Ends
Enter same direction current, forward shouting pain can be just produced in magnet ring, effect is to suppress the common mode disturbances of city's net input.Common-mode choke magnet ring
Using the good core material of air-gap-free high frequency characteristics, coil uses Double-wire parallel wound preparation method, and suitably increase turn-to-turn away from
From to reduce its distribution capacity, raising frequency characteristic.
The operation principle of wherein EMI filter circuit 1 is：When the utility grid of input has common-mode noise, direction identical is made an uproar
Acoustoelectric current produces two magnetic fluxs in coil, and due to forward connecting, magnetic flux is added, and inductance shows high impedance, prevents common mode from making an uproar
Sound access switch power supply, while also prevent noise caused by Switching Power Supply from being spread to public utility grid, in order to avoid pollution alternating current
Net.
And half-bridge harmonic circuit 3 is linked together in the form of totem, and exported, there is provided square-wave signal, realize
Constant current output.Rectifying and wave-filtering output circuit carries out rectifying and wave-filtering in order to adapt to the requirement of LED load characteristic, to its output current,
Extend LED service life.It is well known that EMI filter circuit 1, half-bridge harmonic circuit 3 and rectifying and wave-filtering output circuit 4 are
Circuit known by those skilled in the art, as shown in figure 3, no longer describing in detail herein.
The present invention is connected with power factor correction circuit 2 between EMI filter circuit 1 and the half-bridge harmonic circuit 3, please
Shown in refer to the attached drawing 3, power factor correction circuit 2 of the invention including diode D1, diode D2, diode D3, diode
D4, electrochemical capacitor C10, wherein, diode D1 negative electrode is connected with diode D2 negative electrode, diode D1 anode and diode
D4 negative electrode is connected, and diode D2 anode is connected with diode D3 negative electrode, diode D3 anode and diode D4 sun
Extremely it is connected and is grounded, electrochemical capacitor C10 positive pole is connected with diode D1 negative electrode, electrochemical capacitor C10 negative pole and diode
D3 anode is connected.
Further, the power factor correction circuit also includes diode D5, diode D6, diode D7, diode
D8, electric capacity C3, electric capacity C4, electric capacity C6, diode D5 are connected in parallel with electric capacity C3, and diode D5 is connected to diode D3 and electrolysis
Between electric capacity C10, diode D5 negative electrode is connected with diode D3 anode, and diode D5 anode is with electrochemical capacitor C10's
Negative electrode and diode D8 anode are connected, and diode D6 negative electrode is connected with diode D1 anode, diode D7 negative electrode
It is connected with diode D2 anode, diode D6 anode is connected with diode D7 anode and is grounded by electric capacity C6, two poles
Pipe D6 anode is simultaneously connected with diode D8 negative electrode, and diode D4 anode is grounded by electric capacity C4.The present invention is by setting
Put eight diodes and realize that passive power factor is corrected, further increase the power factor (PF) of the circuit.
In the specific implementation of the present invention, as shown in figure 3, the power factor correction circuit and half-bridge resonance of the present invention
Circuit cooperating, hoisting power factor value and harmonics restraint, its operation principle are as follows：
Electric capacity C4 and electric capacity C6 is partiting dc capacitor and forms vibration with inductance L2, inductance L, triode Q1, triode Q2
Loop, the virtual value of its high-frequency current are controlled by IC, are basically unchanged.Electric capacity C3 is BOOST electric capacity, selects suitable electric capacity
Value so that electric capacity C3 maximum operating voltage is between Vin crest voltages and electric capacity C10 voltages.The sourcing current of input power, when
Inductance L extremely sine wave forward direction when, pass through diode D1, half-bridge harmonic circuit and electric capacity C6, diode D7 and electric capacity C4, two poles
Pipe D3 forms loop, pump electric current from inductance L2, inductance L, triode Q1, triode Q2, electric capacity C6, diode D7 and electric capacity C4,
Diode D3, when half-bridge harmonic circuit constantly vibrates, the continuous impulse electricities of electric capacity C3 so that input current ripple it is substantially continuous and
Follow the waveform of input voltage；When inductance L extremely sine wave negative senses, with during forward direction on the contrary, the sourcing current of input power, passes through
Diode D2, half-bridge harmonic circuit and electric capacity C6, diode D6 and electric capacity C4, diode D4 form loop, and pump electric current is from inductance
L2, inductance Lm, triode Q1, triode Q2, electric capacity C6, diode D7 and electric capacity C4, diode D3, in half-bridge harmonic circuit not
During disconnected vibration, the continuous impulse electricities of electric capacity C3 so that input current ripple is substantially continuous and follows the waveform of input voltage.So
When in whole cycle, input current and input voltage basic synchronization, power factor are effectively improved.
Present invention additionally comprises peripheral circuit known in the art, and it is the technology known by those skilled in the art,
This is repeated no more.
Compared with prior art, because constant-current supply has used the current sample change-over circuit of the present invention, due to setting the
Two resistance R2 resistance size is much larger than first resistor R1 resistance value, therefore flows through second resistance R2 electric current just much smaller than the
One resistance R1 electric current, the electric current for flowing through toggle switch are not more than the current limit of toggle switch, protect toggle switch, prolong
The life-span of long toggle switch.In addition, the i.e. adjustable input current of ratio size and the pass of reference current by adjusting Rs and R2
System, and the cost of constant-current source does not have any increase, also by the purpose to current sample, improves product reliability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Interior made all any modification, equivalent and improvement of god and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of current sample change-over circuit applied to LED power, it is characterised in that the current sample change-over circuit includes perseverance
Chip control circuit, current sampling unit, sample rate current input port, first resistor, second resistance are flowed, the first resistor
One end is connected with one end of the sample rate current input port and the second resistance, another termination of the first resistor
Ground, the other end of the second resistance are connected with constant current chip control circuit and the current sampling unit, the constant current core
The detection magnitude of voltage of piece control circuit is a steady state value, cut-offs control using at least one switch of the current sampling unit
Flow through the size of the electric current of the current sampling unit.
2. the current sample change-over circuit according to claim 1 applied to LED power, it is characterised in that the electric current is adopted
Sample change-over circuit also includes 3rd resistor, and the 3rd resistor is in parallel with the current sampling unit, and the one of the 3rd resistor
End is connected between the constant current chip control circuit and second resistance, the other end ground connection of the 3rd resistor.
3. the current sample change-over circuit according to claim 2 applied to LED power, it is characterised in that described first
Resistance, the second resistance and 3rd resistor are that multiple resistant series or parallel connection form.
4. the current sample change-over circuit according to claim 3 applied to LED power, it is characterised in that the electric current
Sampling unit includes the 4th resistance and first switch, and the first switch is connected with the 4th resistant series, after being connected in series again with
3rd resistor is in parallel, and one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
5. the current sample change-over circuit according to claim 4 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 5th resistance and second switch, and the second switch is connected with the 5th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
6. the current sample change-over circuit according to claim 5 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 6th resistance and the 3rd switch, and the 3rd switch is connected with the 6th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
7. the current sample change-over circuit according to claim 6 applied to LED power, it is characterised in that the electric current
Sampling unit also includes the 7th resistance and the 4th switch, and the 4th switch is connected with the 7th resistant series, after being connected in series again
In parallel with 3rd resistor, one end ground connection for the end points that parallel connection is formed, the other end is connected with the constant current chip control circuit.
8. the current sample change-over circuit according to claim 7 applied to LED power, it is characterised in that described first
Switch, second switch, the 3rd switch, the 4th switch are toggle switch or rotary switch.
9. a kind of LED constant current power supply, including the current sampling circuit described in the claims any one of 1-8 and EMI filtering
Circuit, half-bridge harmonic circuit, rectifying and wave-filtering output circuit, the input of the input connection power supply of the EMI filter circuit, institute
Half-bridge harmonic circuit is stated to be connected with the rectifying and wave-filtering output circuit, it is characterised in that：In the EMI filter circuit and described half
Power factor correction circuit is connected between bridge harmonic circuit, the power factor correction circuit includes diode D1, diode
D2, diode D3, diode D4, electrochemical capacitor C10, wherein, diode D1 negative electrode is connected with diode D2 negative electrode, two poles
Pipe D1 anode is connected with diode D4 negative electrode, and diode D2 anode is connected with diode D3 negative electrode, diode D3's
Anode is connected and is grounded with diode D4 anode, and electrochemical capacitor C10 positive pole is connected with diode D1 negative electrode, electrochemical capacitor
C10 negative pole is connected with diode D3 anode.
A kind of 10. LED constant current power supply according to claim 9, it is characterised in that：The power factor correction circuit also wraps
Diode D5, diode D6, diode D7, diode D8, electric capacity C3, electric capacity C4, electric capacity C6 are included, diode D5 and electric capacity C3 is simultaneously
Connection connection, diode D5 are connected between diode D3 and electrochemical capacitor C10, diode D5 negative electrode and diode D3 anode
Connection, diode D5 anode is connected with the anode of electrochemical capacitor C10 negative electrode and diode D8, diode D6 negative electrode and
Diode D1 anode is connected, and diode D7 negative electrode is connected with diode D2 anode, diode D6 anode and diode
D7 anode is connected and is grounded by electric capacity C6, and diode D6 anode is simultaneously connected with diode D8 negative electrode, diode D4
Anode be grounded by electric capacity C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710769335.3A CN107479607A (en) | 2017-08-31 | 2017-08-31 | A kind of current sample change-over circuit and LED constant current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710769335.3A CN107479607A (en) | 2017-08-31 | 2017-08-31 | A kind of current sample change-over circuit and LED constant current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107479607A true CN107479607A (en) | 2017-12-15 |
Family
ID=60604309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710769335.3A Pending CN107479607A (en) | 2017-08-31 | 2017-08-31 | A kind of current sample change-over circuit and LED constant current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107479607A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925222A (en) * | 2010-01-12 | 2010-12-22 | 海洋王照明科技股份有限公司 | Power output circuit for LED driving device |
| CN202444669U (en) * | 2012-02-16 | 2012-09-19 | 保定市佑德电子科技有限公司 | Intelligent LED (light emitting diode) streetlamp power controller |
| US20130119881A1 (en) * | 2011-11-15 | 2013-05-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Led lighting systems and methods for constant current control in various operation modes |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN103813589A (en) * | 2014-01-24 | 2014-05-21 | 东南大学 | Isolation type high-power light emitting diode (LED) driving power source with multi-output current sharing |
| CN204157140U (en) * | 2014-11-07 | 2015-02-11 | 四川嘉汇电子科技有限公司 | Based on the constant current LED power supplies of power factor compensation |
| DE202016101998U1 (en) * | 2016-04-15 | 2016-05-02 | Zhejiang Twinsel Electronic Technology Co., Ltd. | Control circuit of a switch dimming LED light |
| CN107086026A (en) * | 2017-04-28 | 2017-08-22 | 康佳集团股份有限公司 | A kind of constant-current circuit and television set of driving LED backlight |
-
2017
- 2017-08-31 CN CN201710769335.3A patent/CN107479607A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925222A (en) * | 2010-01-12 | 2010-12-22 | 海洋王照明科技股份有限公司 | Power output circuit for LED driving device |
| US20130119881A1 (en) * | 2011-11-15 | 2013-05-16 | On-Bright Electronics (Shanghai) Co., Ltd. | Led lighting systems and methods for constant current control in various operation modes |
| CN202444669U (en) * | 2012-02-16 | 2012-09-19 | 保定市佑德电子科技有限公司 | Intelligent LED (light emitting diode) streetlamp power controller |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN103813589A (en) * | 2014-01-24 | 2014-05-21 | 东南大学 | Isolation type high-power light emitting diode (LED) driving power source with multi-output current sharing |
| CN204157140U (en) * | 2014-11-07 | 2015-02-11 | 四川嘉汇电子科技有限公司 | Based on the constant current LED power supplies of power factor compensation |
| DE202016101998U1 (en) * | 2016-04-15 | 2016-05-02 | Zhejiang Twinsel Electronic Technology Co., Ltd. | Control circuit of a switch dimming LED light |
| CN107086026A (en) * | 2017-04-28 | 2017-08-22 | 康佳集团股份有限公司 | A kind of constant-current circuit and television set of driving LED backlight |
Non-Patent Citations (1)
| Title |
|---|
| 佚名: "LED Controller for LLC converters", Retrieved from the Internet <URL:https://www.sekorm.com/doc/2042199.html> * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107086026B (en) | A kind of constant-current circuit and television set driving LED backlight | |
| CN202050564U (en) | Dimmable LED (Light-emitting Diode) drive circuit | |
| CN106416428B (en) | LED driver circuit, LED circuit and driving method | |
| CN102523663B (en) | Constant-power LED drive circuit | |
| CN102215615A (en) | Driving circuit for LED (light emitting diode) lamp | |
| CN105592590B (en) | A kind of invariable power LED drive power circuit system | |
| CN201813599U (en) | LED (Light-Emitting Diode) dimmer power | |
| CN104822216B (en) | Low power HID lamp drive circuit | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN102014557A (en) | LED dimming power supply | |
| CN103025009B (en) | A kind of LED Drive and Control Circuit | |
| CN207216474U (en) | A kind of current sample change-over circuit and LED constant current power supply | |
| CN108770117A (en) | A kind of integrated LED drive power of compatible electronic transformer | |
| CN102548093A (en) | Direct-current light emitting diode (LED) constant-current driving circuit and LED lamp | |
| CN106102253B (en) | LED drive circuit and LED lamp tube | |
| CN106804080A (en) | A kind of LED drive circuit and LED | |
| CN105636315A (en) | Lighting device and lighting fixture using same | |
| CN104219855B (en) | Based on APFC without stroboscopic LED constant current drive control circuit | |
| CN102833902A (en) | Boosting LED (light-emitting diode) constant-current drive circuit | |
| WO2018024035A1 (en) | Indicating circuit for switching power supply, and using method therefor | |
| CN101909376A (en) | High-power LED drive circuit | |
| CN206498569U (en) | A kind of high-power LED driving power source | |
| CN106208646A (en) | A kind of directly filtering type Switching Power Supply | |
| CN205883641U (en) | Linear constant current circuit who adjusted luminance in full stroke phase cut angle based on triac dimmer | |
| CN202587528U (en) | Light emitting diode (LED) constant current driving power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171215 |
|
| RJ01 | Rejection of invention patent application after publication |